In the diagram, items '2A and 2B' represent...

Question 1 / 205eccef9bbacbc34ba4d45697

Question 1 of 205eccef9bbacbc34ba4d45697

In the diagram, items '2A and 2B' represent the overboard discharge valves of the ballast system illustrated. According to 46 CFR Part 56, which of the following statements is correct if the vessels length between perpendiculars is 500 feet, and the through hull opening is four feet above the summer load line? See illustration GS-0125.

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🔍 Key Concepts

• 46 CFR Part 56 requirements for overboard discharges and shell valves on ballast systems • How requirements change with vessel length between perpendiculars (LBP) and the height of the opening above the summer load line • The difference between a positive closing valve and an automatic non-return (check) valve and when both are required

💭 Think About

• Look up the specific 46 CFR 56 section that discusses overboard discharges and shell connections and identify what it says for ships of about 500 feet LBP. • Ask yourself whether an opening that is only four feet above the summer load line is treated more like a below‑waterline opening in the regulations, and what extra protection that triggers. • Compare the roles of valves 2A and 2B in the line: which one is closest to the shell, and which one provides the non‑return feature? How would the regulation apply to each location?

✅ Before You Answer

• Verify the exact height criteria in 46 CFR Part 56 that determine when a positive closing valve at the shell is required in addition to a non‑return valve. • Confirm from the diagram which of 2A or 2B is the shell (overboard) valve and which is the automatic non‑return valve. • Check whether the regulation ever allows only one valve in this situation, or whether it clearly requires two devices (one positive closing, one non‑return) for a vessel of this size and discharge height.

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Question 1 of 20

Valve 2A must be positive closing, in addition to the indicated automatic non-return valve feature.

Valve 2B must be positive closing, in addition to the indicated automatic non-return valve feature.

Both valves must be positive closing, in addition to the ability to provide the automatic non-return feature.

Question 1 / 205eccef9bbacbc34ba4d45697

Question 1 of 205eccef9bbacbc34ba4d45697

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Question 1 of 20

5eccef9bbacbc34ba4d45697

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💭 Think About

✅ Before You Answer

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